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A cooperative model for metallocene catalyst activation by methylaluminoxane.

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  • 1Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, FI-80100, Joensuu, Finland. mikko.linnolahti@uef.fi.

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|January 6, 2025
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Summary
This summary is machine-generated.

Density Functional Theory (DFT) investigated rac-Me2Si(η5-Ind)2ZrMe2 (SBIZrMe2) activation by methylaluminoxane (MAO) models. Hybrid anions, formed from MAO components, significantly lower propene insertion barriers, explaining high catalyst activity at elevated Al:Zr ratios.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Computational Chemistry

Background:

  • Metallocene catalysts activated by methylaluminoxane (MAO) are crucial for olefin polymerization.
  • Understanding the precise mechanism of MAO activation and its interaction with metallocenes is essential for catalyst design.
  • Previous studies have explored various MAO models, but detailed mechanistic insights into ion-pair formation and propene insertion barriers remain areas of active research.

Purpose of the Study:

  • To investigate the activation mechanism of rac-Me2Si(η5-Ind)2ZrMe2 (SBIZrMe2) using Density Functional Theory (DFT).
  • To model methylaluminoxane (MAO) as sheet structures and study their interaction with SBIZrMe2.
  • To elucidate the formation of outer-sphere ion-pairs (OSIP) and contact ion-pairs (CIP) and their influence on propene insertion barriers.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to study the activation of SBIZrMe2 by MAO sheet models.
  • The study focused on the reversible formation of outer-sphere ion-pairs (OSIP) and contact ion-pairs (CIP).
  • Propene insertion barriers and Al-binding equilibria were calculated to assess catalytic activity.

Main Results:

  • DFT calculations revealed that SBIZrMe2 can form OSIPs and CIPs with MAO models.
  • Propene insertion into CIPs generally exhibited high barriers (90-100 kJ mol-1), but formation of a hybrid anion ([13,8]-) led to a significantly lower barrier (<60 kJ mol-1).
  • Simulations indicated that the formation of specific MAO-derived species, like the hybrid anion, explains the high activity of MAO-activated metallocenes at high Al:Zr ratios.

Conclusions:

  • The formation of hybrid anions from MAO components plays a critical role in lowering propene insertion barriers.
  • The speciation of MAO components significantly influences the catalytic activity of metallocene complexes.
  • These findings provide a deeper mechanistic understanding of MAO activation, crucial for optimizing olefin polymerization catalysts.